At least six people have been killed in a Russian airstrike on the city of Kharkiv in north-eastern Ukraine, including a 14-year-old girl, the regional military governor said on Friday. At least 40 people were injured, Kharkiv military governor Oleh Synyehubov said. Several districts of Kharkiv were hit by guided bombs, including a 12-storey residential building, which partially collapsed, officials said. Several children are among the many injured, according to the authorities. The city, Ukraine’s second-largest city before the war began, is located about 30 kilometres from the Russian border…